Which One Doesn't Belong?

The Teacher's Bundle includes the 84-page Teacher's Guide, 36-page hardcover student book, and access to digital formats. Which One Doesnt Belong? has won the Mathical Book Prize, which will be presented to Christopher Danielson at the National Math Festival in Washington, DC on April 22, 2017. The Mathical Book Prize is an annual award for fiction and nonfiction books that inspire children of all ages to see math in the world around them. Every colorful page of Christopher Danielsons childrens picture book, Which One Doesnt Belong?, contains a thoughtfully designed set of four shapes. Each of the shapes can be a correct answer to the question Which one doesnt belong? Because all their answers are right answers, students naturally shift their focus to justifications and arguments based on the shapes geometric properties. In the companion teachers guide, Danielson shows how to facilitate rich discussions and teach mathematical argumentation using Which One Doesnt Belong? He models how to listen closely and respectfully to students ideas about shapes. Danielson synthesizes research about how children learn geometry, discusses the role of geometry in the mathematics curriculum, and gives plenty of practical advice about different ways to implement Which One Doesnt Belong? in classrooms. He also discusses the mathematical ideas likely to emerge on each page anddrawing from his direct experience using Which One Doesnt Belong? at several different grade levelshelps teachers anticipate and think about students likely answers. Most curricula treat geometry as little more than vocabulary lessons. Which One Doesnt Belong? and its accompanying guide are powerful, flexible resources teachers can use to provoke lively discussions and deep learning about shapes with students of all ages.